- Tagged template string `composite()` - Takes any number of elements: regex, constant string, array of strings, or generator function. - Transforms into generator function. _Requires no changes to parser._ Example: ```js function* AlbumID() {…} const songIDRegex = /^\d+/; function* GetSong() { const [albumID, [songID]] = yield composite`/album/${AlbumID}/song/${songIDRegex}`; } ```
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